原文:Expression Design与Blend制作滚动的小球动画教程
一，开发工具
Microsoft Expression Design & Blend 4.0 （3.0亦可）。
这两款软件可以在微软Expression官方网站上下载：http://expression.microsoft.com/en-us/default.aspx
二，建立解决方案
在Blend中建立解决方案，菜单栏->File->New Project 输入解决方案名称为WPFAnimations，如下：
建立后视图如下：
三，建立小球控件
选中WPFAnimations项目，右击在ContextMenu中选择New Item，输入名称Ball
从工具栏拖入一个Ellipse，取名为EllipseBall，调整其效果如下：
Ball.xaml的内容如下：
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
x:Class="WPFAnimations.Ball"
x:Name="UserControl"
d:DesignWidth="200" d:DesignHeight="200">
<Grid x:Name="LayoutRoot">
<Ellipse x:Name="EllipseBall" Height="200" Margin="0,0" Stroke="Black" VerticalAlignment="Top">
<Ellipse.Fill>
<RadialGradientBrush>
<GradientStop Color="#FF1A1747" Offset="0.99"/>
<GradientStop Color="#FF4B5DFB"/>
<GradientStop Color="#FF161FAD" Offset="0.604"/>
</RadialGradientBrush>
</Ellipse.Fill>
</Ellipse>
</Grid>
</UserControl>
四，建立整体场景添加小球到MainWindow.xaml
打开MainWindow.xaml文件，调整其背景，添加Canvas，以及相关的元素，并将小球拖拽至其中。
注意：添加用户控件可以通过生成项目后在Assets下面添加：
最终效果如下：
MainWindow.xaml的内容如下：
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WPFAnimations"
x:Class="WPFAnimations.MainWindow"
x:Name="Window"
Title="MainWindow"
Width="800" Height="480">
<Grid x:Name="LayoutRoot">
<Grid.Background>
<LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
<GradientStop Color="#FF3594ED" Offset="1"/>
<GradientStop Color="White"/>
</LinearGradientBrush>
</Grid.Background>
<Canvas x:Name="CanvasMain" Margin="50,20,20,20">
<local:Ball Canvas.Left="-23.333" Canvas.Top="196.667" Width="200" Height="200" RenderTransformOrigin="0.5,0.5">
<local:Ball.RenderTransform>
<TransformGroup>
<ScaleTransform ScaleX="0.4" ScaleY="0.4"/>
<SkewTransform/>
<RotateTransform/>
<TranslateTransform/>
</TransformGroup>
</local:Ball.RenderTransform>
</local:Ball>
</Canvas>
</Grid>
</Window>
五，添加动画效果
用钢笔工具在Canvas中添加如下如所示的路径：
路径的XML为
<Path Data="M70.5,210.5 C175.5,143 181,136.5 244,136.5 307,136.5 319,189 331,207 343,225 347.5,298.5 347.5,298.5 L491.5,340.5 C491.5,340.5 520,391.5 551.5,325.5 583,259.5 622,359.99974 610,244.49988 598,129.00001 614.50012,179.99995 595.00012,135 575.50011,90.000054 664.90289,84.724203 664.90289,84.724203 L489.72622,50.377374 462.77596,162.37791 C462.77596,162.37791 570.57699,278.85847 462.77596,207.17812 354.97494,135.49778 347.48875,72.77748 347.48875,72.77748 L170.81485,65.310778 70.5,78.750842 45.046979,116.08435" Height="310.3" Canvas.Left="45" Stretch="Fill" Canvas.Top="50" Width="621"/>
如果你足够熟悉，这里的路径数据也可以直接通过XML构建或者通过自己编写路径数据，具体参考http://msdn.microsoft.com/en-us/library/ms752293.aspx。
在菜单栏将工作区切换为Animation，如下：
选中Ball对象，在Triggers选项卡中点击Events按钮，添加
单击+event按钮后，设置事件为窗体Window加载后Loaded，单击+按钮添加StoryBoard：
在弹出对话框，点击okay按钮，建立Storyboard后，修改其名称为BeginRollBall
如下图：
在0秒与12秒之间为小球添加路径动画，最终MainWindow.xaml的代码如下：
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WPFAnimations"
x:Class="WPFAnimations.MainWindow"
x:Name="Window"
Title="MainWindow"
Width="800" Height="480">
<Window.Resources>
<PathGeometry x:Key="MyPath" Figures="M70.5,210.5 C175.5,143 181,136.5 244,136.5 307,136.5 319,189 331,207 343,225 347.5,298.5 347.5,298.5 L491.5,340.5 C491.5,340.5 520,391.5 551.5,325.5 583,259.5 622,359.99974 610,244.49988 598,129.00001 614.50012,179.99995 595.00012,135 575.50011,90.000054 664.90289,84.724203 664.90289,84.724203 L489.72622,50.377374 462.77596,162.37791 C462.77596,162.37791 570.57699,278.85847 462.77596,207.17812 354.97494,135.49778 347.48875,72.77748 347.48875,72.77748 L170.81485,65.310778 70.5,78.750842 45.046979,116.08435"/>
<Storyboard x:Key="BeginRollBall" RepeatBehavior="Forever">
<DoubleAnimationUsingPath Duration="0:0:12" PathGeometry="{StaticResource MyPath}" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)" Source="X" Storyboard.TargetName="ball">
</DoubleAnimationUsingPath>
<DoubleAnimationUsingPath Duration="0:0:12" PathGeometry="{StaticResource MyPath}" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.Y)" Source="Y" Storyboard.TargetName="ball">
</DoubleAnimationUsingPath>
</Storyboard>
</Window.Resources>
<Window.Triggers>
<EventTrigger RoutedEvent="FrameworkElement.Loaded">
<BeginStoryboard x:Name="BeginRollBall_BeginStoryboard" Storyboard="{StaticResource BeginRollBall}"/>
</EventTrigger>
</Window.Triggers>
<Grid x:Name="LayoutRoot">
<Grid.Background>
<LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
<GradientStop Color="#FF3594ED" Offset="1"/>
<GradientStop Color="White"/>
</LinearGradientBrush>
</Grid.Background>
<Canvas x:Name="CanvasMain" Margin="50,20,20,20">
<local:Ball x:Name="ball" Canvas.Left="10.25" Canvas.Top="95.25" Width="200" Height="200" RenderTransformOrigin="0.5,0.5">
<local:Ball.RenderTransform>
<TransformGroup>
<ScaleTransform ScaleX="0.4" ScaleY="0.4"/>
<SkewTransform/>
<RotateTransform/>
<TranslateTransform/>
</TransformGroup>
</local:Ball.RenderTransform>
</local:Ball>
<Path Data="M70.5,210.5 C175.5,143 181,136.5 244,136.5 307,136.5 319,189 331,207 343,225 347.5,298.5 347.5,298.5 L491.5,340.5 C491.5,340.5 520,391.5 551.5,325.5 583,259.5 622,359.99974 610,244.49988 598,129.00001 614.50012,179.99995 595.00012,135 575.50011,90.000054 664.90289,84.724203 664.90289,84.724203 L489.72622,50.377374 462.77596,162.37791 C462.77596,162.37791 570.57699,278.85847 462.77596,207.17812 354.97494,135.49778 347.48875,72.77748 347.48875,72.77748 L170.81485,65.310778 70.5,78.750842 45.046979,116.08435" Height="310.3" Canvas.Left="45" Stretch="Fill" Canvas.Top="50" Width="621"/>
</Canvas>
</Grid>
</Window>
运行我们可以看到效果：
由于刚才添加了Canvas导致了小球移动的路径并不是按照钢笔所画路径而是有所偏移。
六，总结
在整个实例中由于对路径的数据处理不是很好 所以导致最终的效果和路径有所偏移，大家可以针对自己的情况作相应的调整。如果对WPF足够的熟悉所有的代码都可以自己的编写，所有的效果动画也都都可以通过code-behind中用c#或者VB.NET等直接编写代码来实现。
如需要本示例源码请回复你的邮箱地址或者发消息~~~
原谅地址：http://kosmisch.net/archive/2010/08/09/befecb03aea741e108fa9301.aspx